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Alex
3 years ago
7

The karyotype for trisomy 21 illustrates an example of a genetic mutation caused by A) insertion. B) inversion. C) crossing over

. D) nondisjunction.
Biology
2 answers:
Katyanochek1 [597]3 years ago
7 0

Trisomy 21, as illustrated by the karyotype, is caused by nondisjunction. This occurs when chromosomes do not separate properly during meiosis.

Answer is D) nondisjunction

aivan3 [116]3 years ago
3 0

Answer:

The correct answer is option C, that is, nondisjunction.

Explanation:

Trisomy 21, also called Down syndrome is a result of the error in the cell division known as nondisjunction. It leaves an egg or sperm cell with an additional copy of chromosome 21 prior to or after conception.  

The phenomenon of nondisjunction can take place during anaphase of meiosis or mitosis. At the time of anaphase, the homologous chromosomes or the sister chromatids get separate and move to the contrary poles of the cell, with the help of microtubules. However, in nondisjunction, this separation does not take place.  

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What does lily pad get from the water
Ganezh [65]
Lily pad is a water plant. It is on top of the water floating in a boat like pad. It gets water and all the energy it needs but it also uses the sun. Lily pads use more of water than sunlight.
Hope this helped!!! >.<
6 0
3 years ago
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Some Latin-American hummingbirds have bills that are long and curved, matching long and sharply curved flowers in their environm
Luba_88 [7]
These two organisms may have evolved by coevolution. The last option in the given question is the correct option. The Latin-American humming birds had to evolve as per their surroundings, otherwise they would have become extinct in that region. For that sole purpose they had to have the long and curved bills. The flowers needed the humming birds for their pollination. To attach with the legs of the humming birds in the region, the flowers had to become sharply curved. The humming birds had to come in contact with the flower while sucking the nectar. this helped the plants in their pollination process. so both became mutually beneficial to each other.
4 0
3 years ago
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Helppp, i’m going to fail:(
Westkost [7]
Don’t worry this is pretty easy :)

The answer is -
50% recessive alleles
50% dominate alleles

explication- find out what alleles you’re working with (heterogeneous and homogeneous)
[heterogeneous is 1 dominant and 1 recessive- homogeneous is 2 of the same alleles they can be dominant or recessive]
We’re working with a parent with heterogeneous and another parent with recessive homogeneous.

draw a allele chart
__
|_|_|
|_|_|
they look like this and take your first parents alleles and put them at the top

L s
_ _
|_|_|
|_|_|

it should look like this, then take your parent with both recessive and put them vertical to the box

L s
_ _
s |_|_|
s |_|_|

it should look like this, now you drag one letter down and one letter across for each box

L s
__ __
s|Ls|ss |
s|Ls|ss |
— —
it’s should look like this when they’re done, i think you’re doing a grade below me in biology so the ratio should be 50/50 for both phenotype and genotype.

TRY TO LEARN THE VOCABULARY IT HELPS A LOT AND BASICALLY TELLS YOU THE ANSWERS!
GOOD LUCK :)
7 0
3 years ago
With reference to the diagrams below, describe how fishes and bottom dwelling polychaete worms cope with the fluctuating salinit
klasskru [66]

Fishes and bottom dwelling worms cope with the fluctuating salinity within estuaries over the tidal cycle with the use of transport system such as active and passive transport.

<h3>How active and passive transport system are used?</h3>

In salty water, fish and other marine organisms used active transport in which energy is used to remove salts from the body of these marine organisms because excess salts are harmful for them.

So we can conclude that Fishes use transport system such as active and passive transport to cope with the fluctuation of salt concentration.

Learn more about salinity here: brainly.com/question/20283396

#SPJ1

6 0
2 years ago
What are similar structures that evolved independently called?
Ilia_Sergeevich [38]

Answer:

Analogous structures

Explanation:

These structures are similar but not derived from the common ancestor like homologous structures. Analogous structures are formed as a result of convergent evolution-type of evolution in which organisms develop on similar way but independently. An example of analogous structures are wings. Birds, insects and bats all have wings, with the same purpose (flight) but they evolved in their own way.

4 0
3 years ago
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